#include <iostream>

using namespace std;

int sum(int,int);
double sum(double,double);
string sum(string,string);
int main(){
    cout<<"Int:"<<sum(3,4)<<endl;
    cout<<"float:"<<sum(3.5,3.5)<<endl;
    cout<<"string:"<<sum("啦啦","哈哈")<<endl;
}
int sum(int a,int b){
    return a+b;
}

double sum(double a,double b){
    return a+b;
}

string sum(string a, string b) {
    return a+b;
}



